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Segment Information (Reconciliation of Segment Income) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment income $ 347 $ 315 $ 855 $ 829
Restructuring and other (12) (20) (26) (19)
Interest expense (64) (59) (187) (181)
Interest income 4 3 10 8
Foreign exchange 0 5 (4) 22
Income before income taxes and equity earnings 287 254 667 641
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment income 368 360 941 913
Segment Reconciling Items        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Restructuring and other (12) (20) (26) (19)
Loss from early extinguishments of debt 0 (10) (7) (37)
Interest expense (64) (59) (187) (181)
Interest income 4 3 10 8
Foreign exchange 0 5 (4) 22
Segment Reconciling Items | Non-reportable segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment income 20 19 52 52
Corporate, Non-Segment        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Corporate and unallocated items $ (29) $ (44) $ (112) $ (117)